Mitigation of server's load by queries for non-existing domains

Tony Finch dot at
Tue Jan 12 17:16:20 UTC 2016

Tomas Hozza <thozza at> wrote:
> Recently I was trying to find a mechanism in BIND that could prevent the
> server from processing a recursive query for non-existing domains.

Have a look at

> I was thinking about using RPZ with QNAME policy trigger, but this
> applies only to the responses to queries and still makes the server to
> try to resolve it.

RPZ has a "qname-wait-recurse no" option.

f.anthony.n.finch  <dot at>
Rockall, Malin: Northwest becoming cyclonic later, 5 to 7 occasionally gale 8
at first. Rough or very rough, becoming moderate or rough. Rain or showers.
Moderate or good.

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